Datasheet

iii
8246A–AVR–11/09
ATtiny2313A/4313
12.5 Input Capture Unit ...........................................................................................91
12.6 Output Compare Units .....................................................................................93
12.7 Compare Match Output Unit ............................................................................95
12.8 Modes of Operation .........................................................................................96
12.9 Timer/Counter Timing Diagrams ...................................................................104
12.10 Accessing 16-bit Registers ............................................................................106
12.11 Register Description ......................................................................................110
13 Timer/Counter0 and Timer/Counter1 Prescalers .............................. 117
13.1 Internal Clock Source ....................................................................................117
13.2 Prescaler Reset .............................................................................................117
13.3 External Clock Source ...................................................................................117
13.4 Register Description ......................................................................................118
14 USART ................................................................................................... 119
14.1 Features ........................................................................................................119
14.2 Overview ........................................................................................................119
14.3 Clock Generation ...........................................................................................120
14.4 Frame Formats ..............................................................................................123
14.5 USART Initialization .......................................................................................124
14.6 Data Transmission – The USART Transmitter ..............................................125
14.7 Data Reception – The USART Receiver .......................................................129
14.8 Asynchronous Data Reception ......................................................................132
14.9 Multi-processor Communication Mode ..........................................................135
14.10 Register Description ......................................................................................136
14.11 Examples of Baud Rate Setting .....................................................................141
15 USART in SPI Mode ............................................................................. 145
15.1 Features ........................................................................................................145
15.2 Overview ........................................................................................................145
15.3 Clock Generation ...........................................................................................145
15.4 SPI Data Modes and Timing ..........................................................................146
15.5 Frame Formats ..............................................................................................147
15.6 Data Transfer .................................................................................................149
15.7 AVR USART MSPIM vs. AVR SPI ................................................................151
15.8 Register Description ......................................................................................152
16 USI – Universal Serial Interface .......................................................... 155
16.1 Features ........................................................................................................155